I just played through Spare Parts last week and I actually enjoyed the game. Made me feel like it was a prologue for the upcoming game Knack. It is also a easy platinum. The worst trophy is grinding to 1,000,000 credits. Considering that I ended the game with about 340,000 credits.
However, I cannot say much for the Poo-Poo club or grinding through a chess game.
This is a list of some of the easiest games though.
NCIS (Plat)
Cabela's Adventure Camp (Plat)
Megamind (Plat)
Cloudy with a Chance of Meatballs (Plat)
Hannah Montana The Movie (Plat)
The Penguins of Madagascar (Plat)
Toy Story Mania (Plat)
Rise of the Guardians (Plat)
Cars Race-O-Rama (Plat)
Up (Plat)
Where the Wild Things Are (Plat)
Under Defeat HD (Plat)
Shrek Forever After (Plat)
Rango (Plat)
Puss in Boots (Plat)
Now if you are ready to grind through all of those children's games then rock on my friend. The bummer is that most of them aren't on PSN.
Cars 2 is in the Store ($19.99) Trophy list below
http://psntrophyleaders.com/game/view/cars-2-ps3
Toy Story Mania ($39.99) Trophy List Below
http://psntrophyleaders.com/game/view/disney•pixar-toy-story-mania-ps3
Rise of the Guardians ($29.99) Trophy List Below
http://psntrophyleaders.com/game/view/rise-of-the-guardians-ps3
Under Defeat HD Deluxe Edition ($29.99) Trophy List Below
http://psntrophyleaders.com/game/view/under-defeat-hd-deluxe-edition-ps3
also stacks with the trophies below, but that one isn't on the PSN store
http://psntrophyleaders.com/game/view/under-defeat-hd-ps3
Last thing for this long post. I tried to only list US games. There are plenty of super easy JP games I just didn't want to list them because the funding could be an issue at times. At least I know I primarily deal with just US games because I can use PayPal quite easily.